ABS_PRESSURE
evdev_send_event(evdev, EV_ABS, ABS_PRESSURE, 0);
{ ABS_MT_PRESSURE, ABS_PRESSURE, 255 },
evdev_push_abs(sc->evdev_a, ABS_PRESSURE, f->p);
{ ABS_PRESSURE, 0, ELANTECH_FINGER_MAX_P, 0 },
{ ABS_PRESSURE, 0, ELANTECH_FINGER_MAX_P, 0 },
evdev_push_abs(sc->evdev_a, ABS_PRESSURE, 0);
evdev_push_abs(sc->evdev_a, ABS_PRESSURE, 0);